Currently for sale on eBay, this Big Wheel is claimed to be in unused condition and even comes with its original box—the holy grail for vintage-toy collectors.

The basic principle of the monowheel is easy enough: build a big enough wheel, and you can fit a rider in it along with a motor to move the whole works forward.

The Big Wheel was inducted into The Strong’s National Toy Hall of Fame in 2009. A.I. assisted with the formatting of this story. Click here to see how WHEC News 10 uses A.I.